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Has anyone successfuly ran any 390 block at 4.125 bore or even at 4.095?

January 11 2018 at 3:29 PM
Bill Ballinger  (Login 65billgal)

I have a 105 block that was a 360 originally, but no sonic yet. I have a 4.11 bore block that is too thin to build in the corner.

If I did have a good sonic on the 105, what should the specs be to go its best? IE trust, non, thrust, between, etc. And assuming it would yield a decent sonic, I would want to keep it at 4 inch stroke and go light on pistons, what would the maximum tq and hp can it be pushed to? I want to get to 400-420+ ci and use the BBMs to a good use? I am passing this to my son so he he an try it later if he blows up the 394, it is almost 20 yrs since I built it. What are the .040 over 4.25 strokers doing with a stock block?


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